EP2821446B1 - Revêtements de très faible brillance avec une haute résistance au brunissage - Google Patents

Revêtements de très faible brillance avec une haute résistance au brunissage Download PDF

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EP2821446B1
EP2821446B1 EP14175573.6A EP14175573A EP2821446B1 EP 2821446 B1 EP2821446 B1 EP 2821446B1 EP 14175573 A EP14175573 A EP 14175573A EP 2821446 B1 EP2821446 B1 EP 2821446B1
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Prior art keywords
coating composition
coating
weight
composition according
aromatic
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German (de)
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EP2821446A1 (fr
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Marcello Vitale
Franco Fogliani
Nilam Shah
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IVM Chemicals Srl
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IVM Chemicals Srl
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D15/00—Woodstains
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/42—Gloss-reducing agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica

Definitions

  • the present invention refers to very low gloss coatings with high resistance to burnishing.
  • Paints, varnishes and coatings constitute the interface with the environment of a large portion of the items that surround us, and of most wood surfaces. Paints, varnishes or coatings are defined in the context of the present invention as those materials that form a continuous layer around, connected to or interpenetrating a support of some other material, for example a wall, a metal item, a plastic object or, indeed, a wood surface.
  • They are prepared, transported and stored as a liquid able to form a thin layer (1-300 g/square meter of covered surface, more if applied in overlaid coats) on the support when applied with a variety of methods, such as by brush, rag, spray, flow, roll, curtain coat or sponge, also with the aid of electrostatic charge, under pressure or with forced flow of air or inert gases.
  • they can be prepared, transported and stored as a relatively low T g or melting point solid, which is turned into a liquid able to form a thin layer on the substrate at the time of application by suitably increased temperature.
  • Such thin layer subsequently becomes solid by a variety of mechanisms, with the solvent or carrier water, if present, evaporating or being otherwise expelled and the binder molecules reacting with each other to form cross-links and/or intertwining around each other.
  • the present invention does not concern coatings formed by sputtering, chemical vapour deposition, physical vapour deposition or other high-vacuum methods. With this exception, the words "paint”, “varnish”, “coating”, “coating composition” or “coating formulation” are employed as synonyms in the text of the present application.
  • Wood coatings are mainly meant to provide an aesthetic benefit: they enhance the beauty of the wood itself by increasing the contrast between the regions of different density (anfeurung or grain enhancement), make its colour uniform or transform it altogether in the case of coloured or pigmented paints. Therefore, in estimating the durability of a wood coating, it is not sufficient to focus on its ability to provide protection with respect to physical and chemical damage. Even if a paint surface is perfectly sound and continuing to perform its protective function on the underlying substrate, its appearance might change over time in such a way as to decrease the value of the overall object. For example, there could be yellowing due to photochemical or thermal processes, or loss of gloss resulting from microscopic scratches. In the case of matte products, the increase in gloss, or burnish, is equally disagreeable, especially whereas it occurs unevenly as a consequence of a mechanical stress such as rubbing or polishing.
  • Gloss is not a measure of how much light is reflected from a surface but rather of how such light is reflected.
  • surfaces reflecting most of the incident light for example white surfaces, can be of any gloss, including highly glossy or highly matte. The same is true for surfaces reflecting only small fractions of the incident light, such as black surfaces that absorb most incident light, or transparent surfaces that transmit most incident light. They can be of high or low gloss, too, and so can, of course, surfaces of intermediate reflectivity, such as those in which wood is coated with a transparent varnish.
  • Light can be reflected specularly, that is, mirrorlike; in such a case, reflection follows the rules of Newtonian optics, which dictate that the reflected beam forms with the reflecting surface an angle equal to that formed by the incident beam. Or, light can be scattered, that is reflected according to a statistical distribution of angles. The greater the fraction of total reflected light that is reflected specularly, the higher the gloss. Conversely, a surface with very low gloss scatters most of the reflected light. Gloss-reducing scatter is due to interaction of light with micro- and nano-sized features of the surface. Such features are commonly obtained in paint by the presence of particles of appropriate size, usually between a few to a few tens of micrometers.
  • Such micrometric materials must also possess other properties in order to be useful in wood paint. Firstly, they must not sink rapidly in the liquid paint, settling in the storage tanks or cans in such a way as to be difficult to stir back homogeneously, or positioning mostly too far below the front surface when the paint is drying and forming the final solid film. Moreover, they must not absorb light or scatter it once such light has entered the coating layer. If they did that, the coating would no longer be transparent. In order to fulfil this latter condition, the matting agents must possess an optical refraction index identical or very close to the film-forming material, i.e. those components of the paint that form the large majority of the solid dry film, that is mostly the binder.
  • Good matting agents include microparticles of silica (silicon oxide), organic polymers or ceramic materials. It appears also well established that the maximum matting power, that is the greatest decrease in gloss per unit weight of the matting material, is obtained when the particles are rough-shaped and present sharp angles, rather than being smooth, regular or spherical. The lowest gloss values, less than about 20, can only be obtained with very rough surfaces, in which the matting particles are present at the surface in large quantity. In such conditions, the surface itself becomes very fragile on a microscopic level: even if the polymeric network is not easily scratched or eroded, it becomes much easier to
  • WO9906461 teaches a matte powder coating for plastic materials, using blocked polyisocyanates, which requires temperatures of over 100°C in order to be activated, temperatures that are not compatible with wood substrates.
  • US2013030106 shows a matte transparent finish for automotive characterized by combining a silica matting agent with talc.
  • the claimed increase in mechanical resistance is clearly insufficient at the lowest gloss achievable within their range of component concentrations, about 20.
  • WO2011146123 teaches how to obtain a very low gloss UV-curable composition (an excellent result in itself), but does not claim any improvement in burnish resistance over the state of the art.
  • WO2008127767 describes coating compositions achieving medium gloss and a small degree of burnish resistance by the use of fluoropolymer binders in thin-layer applications.
  • US7439299 presents low gloss waterborne coatings obtained using as binders dispersions of specific polyurethane copolymers, but does not claim improved burnish resistance over the art.
  • Very low gloss values in combination with the best mechanical resistance performance are currently obtained most conveniently using paint systems comprising a volatile component, which ensures a volume decrease in going from liquid paint to dry paint, a cross-linkable binder, and a chemical cross-linking mechanism, in the presence of efficient matting agents.
  • paint systems comprising a volatile component, which ensures a volume decrease in going from liquid paint to dry paint, a cross-linkable binder, and a chemical cross-linking mechanism, in the presence of efficient matting agents.
  • polyurethane paints originally described, in a general sense, in Bayer's patents from the 1950's, such as GB737385 and US2897166 ), that is polyisocyanate-crosslinked polyols, usually polyester, polyurethane or polyacrylic polyols.
  • US2012107618 discloses such a formulation including urethane polyols, but it is limited to gloss values of over 20, measured at an angle difference of 60°.
  • US6878771 teaches moisture-curing low gloss polyurethane pigmented formulations including tertiary amine catalysts, a kind of composition which is known to be difficult to control in industrial applications.
  • Another example of such a strategy for an application where coating rigidity or final aesthetics are not a problem is described in JP2003025492 for a steel protection coating, applied on steel surface when such steel is produced.
  • the main goal is to form a coating that has very low water (liquid or vapour) permeability and that also possesses the ability to bind metal sites where oxidation is starting, thus avoiding the formation of connected oxide-hydroxide links which are determinant for corrosion spreading.
  • a hybrid organic/inorganic network including, for example, nanomeric (such as Aerosil type fuming silica) or colloidal silica and an organic component with silane, siloxane, amine or thiol binding groups, interpenetrating the regular polymeric binder.
  • nanomeric such as Aerosil type fuming silica
  • colloidal silica an organic component with silane, siloxane, amine or thiol binding groups
  • WO2013130083 teaches a composition used as a protective coating for ELP charge transfer rollers, comprising an aliphatic polycarbonate polyol and an aromatic polyisocyanate, or a polyisocynate in which the aromatic polyisocyanate is at least 50% of total polyisocyanate (page 4, lines 23-27 of WO'083), and silica matting agents, in addition to other components such as conductive agents.
  • the NCO/OH ratio is no larger than 1,5 (page 5, line 33 of WO'083) and the coating is cured at a temperature higher than 70°C for at least 30 hours, again it is disclosed a procedure highly impractical for wood coatings.
  • Such composition certainly shows a great scratch resistance and the ability to hold tightly great amounts of other additives, while at the same time being impervious to contamination from the toner that might be passed over from the printing roller.
  • it is also extremely rigid and has no resistance to burnish, which is fine for the intended application which is purely functional without any aesthetic necessity.
  • US2005/271881 teaches low gloss compositions including any NCO-terminated polyurethane prepolymer cured with amines of various molecular weights as abrasion-resistant coatings. Although the abrasion resistance obtained appears significant, no teaching is present about scratch or burnish resistance, the goal of the document being a coating which protects the substrate from pitting. All examples include TDI-only-based polyurethane prepolymers. The overall system is likely to be microscopically rigid even while showing a significant bulk stretchability.
  • Polyurethane prepolymers partially cured with amines are also described in EP 1489120 , as part of a radiation-curable coating with soft touch properties.
  • Isocyanates are added to unsaturated acrylic polyester polyols and a variety of other reactive polymers in one step, to form NCO-terminated polyurethane prepolymers, then reacted with amines to become larger and more branched. Then the coating is cured with UV radiation.
  • the ratio aromatic/aliphatic polyisocyanates is never mentioned.
  • This coating ensures a degree of chemical resistance, always a problem for soft touch products, however nothing is said about gloss and scratch or burnish resistance of the coating.
  • the present invention presents a great improvement in the performance achievable in such systems as concerns the resistance to burnish, solving all of the problems described above.
  • a first aim of the present invention is that of individuating paint formulations able to provide surfaces with very low gloss highly resistant to burnish.
  • a further aim is that of individuating paint formulations able to provide surfaces with a very attractive look and pleasant feel to the touch, and without affecting unduly any other characteristic of the paint such as in-can stability, viscosity, drying speed, elasticity, toughness, chemical resistance and so on.
  • the present invention relates to a coating composition for a substrate comprising a cellulosic material or wood comprising
  • the coating composition according to the present invention solves the above indicated technical problem by the combination of specific binders and crosslinkers in a relatively narrow range of highly unusual ratios, in the presence of a silica microparticles matting agent.
  • the coatings produced fail to fulfil the expected performance requirement in one or more aspects, and are unsuitable for industrial applications, in particular as practiced in the wood coating industry.
  • the present invention concerns also the use of said coating composition as a coating applied to a substrate comprising a cellulosic material or wood and the method of preparation of a coating based on said coating compositions, comprising:
  • a further object of the present invention is a Kit comprising said coating compositions, wherein components a), b) and possible other components different from c) constitutes a first element A of the kit, while component c) constitutes a second element B of the kit, the two elements A and B being mixed just at the moment of using the coating composition.
  • the component a) of the coating composition according to the present invention consists of polyester polyols that are substantially aliphatic, that is aromatic components comprise less than 2 % in weight of the polyester; such polyester polyol are also substantially saturated, that is their composing C atoms are substantially all bound by single bonds: less than 0.1% of the C-C bonds are reactive C-C double or triple bonds. They are substantially linear, that is their composing monomers are substantially all monovalent or divalent and join substantially all head-to-tail to form a simple chain, without branching. Less than 1% of the composing monomers are trivalent or of higher functionality. Moreover, they have OH%, defined as the weight of OH groups in 100 g of polymer, comprised between 0.5 and 3, most preferably between 1 and 2.
  • Possible composing monomers include, for example, linear or cyclic diacids with a number of carbon atoms comprised between 1 and 18, most preferably between 2 and 10, linear or cyclic glycols with a number of carbon atoms between 1 and 18, most preferably between 2 and 12, and glycol ethers with a number of ether groups between 1 and 10, most preferably between 1 and 5, and length of the carbon chains from oxygen to oxygen between C1 and C12, most preferably between C2 and C6.
  • the component monomers may bear other reactive groups such as carboxyl, amines, acryls and so on.
  • Particularly preferred monomers are linear diacids with a number of carbon atoms comprised between 6 and 8 and a glycol ether with one ether group.
  • the polyester polyol of the invention can conveniently constitute between 50 % and 95%, and most conveniently between 70% and 90% in weight of the total dry weight of the coating composition, excluding from such total the weight of the silica matting agent and the weight of the polyisocyanates.
  • the remaining fraction can comprise, for example, other binders or polymers, which can be polyols able to react with isocyanate, non reactive, or possessing other crosslinking capability such as by reaction with water, oxygen or crosslinking agents other than polyisocyanates, or by photoinitiated cationic or radicalic crosslinking.
  • Such other binders or polymers can be by their chemical nature acrylates, methacrylates, vinyls, urethanes, ureas, alkyds, esters, ethers, silicones, phosphates, aminoacids or amides, fluorinated compounds, under the guise of molecules or polymers of any molecular weight, copolymers combining any of the above or a mixture of any of the above, among others.
  • the component b) of the coating composition according to the present invention consists of one or more silica microparticles matting agents which can be made, for instance, of thermal, fumed, pyrogenic, sol-gel or precipitated silica.
  • the particles can be porous or non-porous, with an untreated surface or functionalized or coated with any number of materials, such as waxes, hydrocarbons, polyolefins, silicones, silanes or siloxanes, as known in the art.
  • the particles can be of regular or irregular shape, and their average equivalent diameter varies between 1 and 20 microns.
  • Their pH can be between 4 and 10. Combinations of more than one such matting agents can be used.
  • the matting agents can conveniently constitute between 0.5% and 20% of the dry weight of the coating composition and most conveniently between 2% and 20%.
  • the surface gloss measured at 60° angle difference varies between 0 and 40, preferably between 0 and 20.
  • the selection of the specific matting agents to use in each particular formulation is driven, as known in the art, by the target gloss, interaction with other formulation components and coating thickness both wet and after drying.
  • the component c) of the coating composition according to the present invention consists of aromatic polyisocyanates which can be made, among other monomers, from toluene diisocyanate (TDI), from diphenylmethylene diisocyanate (MDI) or combinations thereof.
  • the aliphatic polyisocyanates can be made, among others monomers, from hexamethylene diisocyanate (HDI), from isophorone d-isocyanate (IPDI) or combinations thereof.
  • Mixed polyisocyanates can be composed of aromatic and aliphatic fragments chosen, among others, from those listed above. All of them can be dimers, trimers, tetramers, pentamers or of higher dimensionality, even polymeric, and can include components with blocked isocyanate groups.
  • the polyisocyanates and polyols are usually combined only at the time of application, since they react rapidly and a complete composition comprising all constituents could not be conveniently stored, with the sole exception of those embodiments using blocked polyisocyanates. Therefore, in most embodiments, the components of the coating composition according to the present invention, excluding polyisocyanates, form a part A whereas the polyisocyanates are included in a part B along with, eventually, other components which do not react with isocyanates.
  • Either or both part A and part B, and therefore the overall coating composition may additionally include one or more of the aromatic or aliphatic organic solvents, water, coalescents, pigments, colorants, organic or inorganic fillers, dispersants, surface-active agents, organic or inorganic matting agents, rheology modifiers, catalysts, stabilizers, silicones, waxes, polymer particles, UV absorbers and any other additive employed in the art.
  • the addition of silicones which confer good slip properties to the surface, and especially of reactive silicones which are able to crosslink to one or more of the coating binders and/or the polyisocyanates, is particularly advantageous.
  • the coating compositions of the invention can be either solvent-borne or waterborne.
  • possible solvents include benzene, toluene, xylene and any other aromatic solvents, ethyl acetate, propyl acetate, butyl acetate, isobutyl acetate and any other acetates, acetone, methyl ethyl ketone and any other ketones, ethanol, propanol, isopropanol and any other alcohol, any glycol and glycol ether and any other solvent used in the art
  • the polyester polyols of the invention are most conveniently prepared as or transformed in an emulsion in water.
  • Emulsification can be achieved by way of emulsifying groups which can be part of the polyester polyol chain or separate compounds (ions, salts, molecules or polymers) or a combination thereof.
  • emulsifying groups include polyethers and modified polyethers, fatty acids and their salts, phospholipids, alkyl sulphates or phosphates and so on. Further modifications can be imparted to the emulsified polyester, for example by urethanization, as known in the art.
  • Waterborne compositions can additionally include any cosolvent or coalescent known in the art.
  • the coating compositions of the invention are prepared, transported and stored as a low-viscosity liquid able to form a thin layer (5-200 g/square meter of covered surface, more if applied in overlaid coats) on the support when applied with a variety of methods, such as by brush, rag, spray, flow, roll, curtain coat or sponge, also with the aid of electrostatic charge, under-pressure or forced flow of air or inert gases.
  • the coating composition of the invention can be applied on bare, stained or previously coated substrates, in a single layer or in several layers.
  • Eventual underlying coats can be of any coating technology known in the art such as waterborne, solventborne, 100% (solventless), liquid, from solids or from vapours.
  • Drying of the applied coating is carried out, as usual for wood coatings, at temperatures lower than 70°C, often at room temperature.
  • a great advantage of the coatings of the present is in that they show superior resistance to burnishing even at extremely low gloss, coupled with great scratch resistance, without compromising either the visual or tactile qualities of the finish or those characteristics that make the coating formulation suitable for industrial application.
  • the coating compositions in the examples are all made up of a first component (part A) containing binders, solvents (including water), matting agents, other solids, surface-active or rheology-modifying agents, emulsifying agents (in waterborne formulations), catalysts and so on, of a second component (part B) comprising crosslinking agents which may be also diluted with solvents, and, eventually, of a third component consisting of a diluent mix (part C) used to tune the viscosity to fit the application mode on the substrate.
  • component concentrations are always given as parts by weight.
  • binders were used in the examples Table I - characteristics of example binders OH% Average MW nature Typical polyester polyol 4.5 5000 Branched, with some aromatic components Invention polyester polyol 1.6 1900 Linear with substantially only aliphatic saturated components
  • the typical polyester polyol employed here is composed of six parts of phthalic anhydride, four parts of trimethylol propane, three parts of fatty acids from coconut oil and one part of propyl glycol, by weight.
  • the invention polyester polyol is composed of adipic acid and diethylene glycol in proportions of 1.35:1 by weight.
  • Inventive Example 1 A solventborne first component, 1A, containing a low-hydroxyl-number, linear polyester polyol according to the present invention as defined in Table I, was prepared as reported in Table II.
  • Table II - solventborne first component formulation 1A Invention polyester polyol 25 Methyl ethyl ketone 18 Isobutyl acetate 18 Butyl acetate 25 Methoxy propyl acetate 7.3 Filming agent* 3
  • Rheological agent 0.1 Dibutyil tin dilaurate 0.1 * non-reactive, linear polyurethane resin based on MDI ** the silica matting agent is a treated pyrogenic silica with D50 9.5 microns
  • a second component 1B was also prepared, comprised of diluted polyisocyanate crosslinkers according to the formulation reported in Table III.
  • Table III - solventborne second component formulation 1B Mixed TDI-HDI 3:2 polyisocyanate 30 HDI-based isocyanurate 33 Butyl acetate 32 Ethyl acetate 5
  • a diluent mix 1C was prepared according to the formulation of Table IV.
  • Table IV - solventborne diluent 1C Methyl isobutyl ketone 55 Methoxypropanol acetate 35 Isobutyl acetate 10
  • Example Composition 1 100 parts of 1A were combined with 20 parts of 1B and 30 parts of 1C, thereby obtaining Example Composition 1.
  • the total reactive isocyanate groups content was 2.5 times the stoichiometric ratio with reactive hydroxyl groups.
  • the ratio of aromatic to aliphatic isocyanate groups was 2:5.
  • Comparative Example 2 A second component 2B was prepared, comprised of diluted polyisocyanate crosslinkers, according to the formulation reported in table V.
  • Table V - solventborne second component formulation 2B HDI-based isocyanurate 57 Butyl acetate 37 Ethyl acetate 6
  • Example Composition 2 100 parts of 1A were combined with 20 parts of 2B and 30 parts of 1C, thereby obtaining Example Composition 2.
  • the ratio of reactive isocyanate group to reactive hydroxyl groups in Example Composition 2 was 2.5, equal to that in Example Composition 1.
  • the ratio of aromatic to aliphatic isocyanate groups was 0:1, that is only aliphatic isocyanates were present.
  • Comparative Example 3 - A second component 3B was prepared, comprised of diluted polyisocyanate crosslinkers, according to the formulation reported in table VI.
  • Table VI - solventborne second component formulation 3B Mixed TDI-HDI 3:2 polyisocyanate 47 Butyl acetate 46 Ethyl acetate 7
  • Example Composition 3 100 parts of 1A were combined with 30 parts of 3B and 20 parts of 1C, thereby obtaining Example Composition 3.
  • the ratio of reactive isocyanate group to reactive hydroxyl groups in Example Composition 3 was 2.5, equal to that in Example Compositions 1 and 2.
  • the ratio of aromatic to aliphatic isocyanate groups was equal to that in the mixed TDI-HDI polyisocyanate, that is 3:2.
  • Example Composition 4 100 parts of 1A were combined with 10 parts of 1B and 30 parts of 1C, thereby obtaining Example Composition 4.
  • the total reactive isocyanate groups content was 1.25 times the stoichiometric ratio with reactive hydroxyl groups.
  • the ratio of aromatic to aliphatic isocyanate groups was 2:5 as in Example Composition 1.
  • 5A is identical to 1A except for the polyester polyol employed.
  • Example Composition 5 100 parts of 5A were combined with 20 parts of 1B and 30 parts of 1C, thereby obtaining Example Composition 5.
  • the total reactive isocyanate groups content was 1.2 times the stoichiometric ratio with reactive hydroxyl groups.
  • the ratio of aromatic to aliphatic isocyanate groups was 2:5 as in Example Compositions 1 and 4.
  • Example Composition 6 100 parts of 1A were combined with 28 parts of 1B and 30 parts of 1C, thereby obtaining Example Composition 6.
  • the total reactive isocyanate groups content was 3.5 times the stoichiometric ratio with reactive hydroxyl groups.
  • the ratio of aromatic to aliphatic isocyanate groups was 2:5 as in Example Compositions 1, 4 and 5.
  • Example 7 A second component 7B was also prepared, comprised of diluted polyisocyanate crosslinkers according to the formulation reported in Table VIII.
  • Table VIII - solventborne second component formulation 7B Mixed TDI-HDI 3:2 polyisocyanate 40 HDI-based isocyanurate 24 Butyl acetate 31 Ethyl acetate 5
  • Example Composition 7 100 parts of 1A were combined with 20 parts of 7B and 30 parts of 1C, thereby obtaining Example Composition 7.
  • the total reactive isocyanate groups content was 2.5 times the stoichiometric ratio with reactive hydroxyl groups, equal to that in Example Compositions 1, 2 and 3.
  • the ratio of aromatic to aliphatic isocyanate groups was 3:5.
  • Example Composition An aliquot of each Example Composition from 1 to 7 was used to spray paint several standard wood panels, over a polyester bottom coat, depositing 120 g/m 2 of the wet paint.
  • the samples so obtained were tested at room temperature (RT) and ambient humidity to measure the time required to reach dust-free and dry-hard state according to the standards set in ASTM D 1640. Gloss, measured at 60° angle difference after at least 24 hrs, ranged between 3 and 5.
  • Comparative Examples 1, 6 and 7 perform exceptionally in burnish resistance and scratch resistance while keeping sufficiently rapid drying times to be industrially applicable.
  • Comparative Example 2 which has a ratio of aromatic to aliphatic isocyanate groups outside the inventive range, although showing equally outstanding scratch and burnish resistance, dries too slowly for modern industrial applications. Moreover, it presents too little resistance to some cold liquids (such as red wine, as shown) to be accepted for use on most objects.
  • Comparative Examples 3, 4 and 5 presenting a ratio of aromatic to aliphatic isocyanates or a ratio of reactive isocyanate groups and reactive hydroxide groups outside the inventive ranges, or using a polyester polyol not corresponding to the inventive parameters, all fail to improve on the state of the art in burnish and scratch resistance.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (12)

  1. Une formulation de revêtement pour un substrat composé de matériaux cellulosiques ou de bois comprenant:
    a. Un liant polyol polyester essentiellement aliphatique saturé, et essentiellement linéaire avec %OH compris entre 0.5 et 3
    b. Un ou plusieurs agents matants constitué de microparticules de silice dont le diamètre équivalent médian est compris entre 1 et 20 micron.
    c. Un mélange de polyisocyanates aromatiques et aliphatiques et/ou de polyisocyanates mixtes composés d'unités aliphatiques et aromatiques, dans lesquels les unités polyisocyanates ou aromatiques sont caractérisées en ce que le rapport en nombre de leurs groupes réactifs isocyanates respectifs est compris entre 1:5 et 4:5 et de préférence entre 3:10 et 6:10.
    Dans la dite formulation de revêtement, le nombre total de groupes réactifs isocyanates étant compris entre 1,8 et 4 fois le nombre de groupes réactifs hydroxyle, et de préférence compris entre 2 et 3,5 fois.
  2. Un revêtement selon la revendication 1, dans lequel le polyol polyester est présent en quantité comprise entre 50% et 90% en poids, de préférence entre 70% et 90% en poids, du poids sec total de la formulation de revêtement, en excluant de ce poids sec total le poids de la silice matante et le poids des polyisocyanates.
  3. Un revêtement selon l'une des revendications précédentes, dans lequel le polyol polyester est formé de diacides linéaires comprenait un nombre d'atomes de carbone entre 6 et 8 et un éther de glycol comprenant un seul groupe éther.
  4. Un revêtement selon l'une des revendications précédentes, dans lequel le composant b) est formé d'une ou de plusieurs agents matants choisis parmi des microparticules de silice thermique, de fumée de silice, de silice pyrogénique, de sol gel de silice ou de silice précipitée, dans une quantité qui comprise entre 0,5% et 20% en poids du poids sec total de la formulation de revêtement.
  5. Un revêtement selon l'une des revendications précédentes, dans lequel les polyisocyanates sont constitués ou comprennent des oligomères contenant des monomères isocyanates aromatiques ou aliphatiques.
  6. Un revêtement selon l'une des revendications précédentes, comprenant également des composés volatils comme des solvants organiques, des cosolvants, des coalescents ou de l'eau, les composants volatils étant présent en quantité de 5% à 90% en poids du poids total de la formulation de revêtement.
  7. Un revêtement selon la revendication 6), dans lequel l'eau est présente en quantité de 10% à 80% en poids du poids total de la formulation de revêtement.
  8. Un revêtement selon l'une des revendications précédentes, comprenant également un ou plusieurs autres liants ou polymères réticulants ou non réticulants, des pigments, des colorants, des charges organiques ou inorganiques, des dispersants, des agents de surface, des agentes matants organiques ou inorganiques, des modificateurs de rhéologie, des catalyseurs, des stabilisants, des silicones, des cires, des particules de polymères, des absorbeurs d'UV et d'éventuels additifs supplémentaires.
  9. Un revêtement selon l'une des revendications précédentes, comprenant au moins un modificateur de tension superficielle siliconé, et de préférence un modificateur de tension superficielle siliconé réactif qui se lie aux autres composants de la formulation de revêtement.
  10. L'utilisation de la formulation de revêtement selon l'une des revendications précédentes, comme revêtement appliqué sur un substrat comprenant un matériau cellulosique ou du bois.
  11. La méthode de préparation d'une formulation de revêtement à base de la composition de revêtement décrite selon l'une des revendications 1) à 9), dans laquelle
    i. La formulation de revêtement est appliquée sur un support, et
    ii. La formulation de revêtement filme ou coalesce en formant une pellicule essentiellement continue, et qui réticule par réaction des groupes isocyanates avec les groupes hydroxyle.
  12. Un kit comprenant le revêtement décrit selon l'une des revendications de 1) à 9), dans lequel les composants a) et b) et d'éventuels composants supplémentaires, différents de c), constituent un premier élément A du kit, et le composant c) constitue un second élément B du kit, les deux éléments A et B étant mélangés uniquement au moment de l'utilisation du revêtement.
EP14175573.6A 2013-07-04 2014-07-03 Revêtements de très faible brillance avec une haute résistance au brunissage Active EP2821446B1 (fr)

Applications Claiming Priority (1)

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IT001125A ITMI20131125A1 (it) 2013-07-04 2013-07-04 Rivestimenti di bassissima brillantezza e con elevata resistenza alla lucidatura

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IT (1) ITMI20131125A1 (fr)
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ITUB20150557A1 (it) * 2015-03-12 2016-09-12 Novamont Spa Composizione legante e suo impiego in processi di produzione di pannelli in fibra di legno.
DE202015101656U1 (de) 2015-04-02 2015-04-20 Bollig & Kemper Gmbh & Co. Kg Beschichtungszusammensetzung sowie daraus hergestellte Lackierung
KR102101224B1 (ko) * 2015-07-21 2020-04-17 에스더블유아이엠씨 엘엘씨 신규 바이오기반 폴리에스테르
TWI662060B (zh) 2016-12-02 2019-06-11 美商片片堅俄亥俄州工業公司 含聚矽氧之聚酯、含其之塗料組合物及由其形成的塗層

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PL2821446T3 (pl) 2017-01-31
ITMI20131125A1 (it) 2015-01-05
PT2821446T (pt) 2016-10-11
EP2821446A1 (fr) 2015-01-07

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